diff --git a/llms/mlx_lm/server.py b/llms/mlx_lm/server.py
index 4124dfa0..334a17d1 100644
--- a/llms/mlx_lm/server.py
+++ b/llms/mlx_lm/server.py
@@ -133,15 +133,15 @@ def process_message_content(messages):
     processed_messages = []
     for message in messages:
         message_copy = message.copy()
-        if "content" in message_copy:
-            flattened_text = ""
-            if isinstance(message_copy["content"], list):
-                for content_fragment in message_copy["content"]:
-                    if content_fragment["type"] == "text" and "text" in content_fragment:
-                        flattened_text += content_fragment["text"]
-                    else:
-                        raise ValueError("Only 'text' content type is supported.")
-            message_copy["content"] = flattened_text
+        if "content" in message_copy and isinstance(message_copy["content"], list):
+            text_fragments = [
+                fragment["text"]
+                for fragment in message_copy["content"]
+                if fragment.get("type") == "text"
+            ]
+            if len(text_fragments) != len(message_copy["content"]):
+                raise ValueError("Only 'text' content type is supported.")
+            message_copy["content"] = "".join(text_fragments)
         processed_messages.append(message_copy)
     return processed_messages